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Texas Instruments TMS320F28004 Series, Manual

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Texas Instruments TMS320F28004 Series Manual Download Page 28

Advisory

Boot ROM: Calling SCI Bootloader from Application

Revisions Affected

0, A, B

Details

The ROM SCI bootloader uses autobaud lock to lock the baud rate. The SCI baud rate 
is split between two registers, SCILBAUD and SCIHBAUD. The ROM SCI bootloader 
expects SCIHBAUD to contain its default reset value of zero. If the ROM SCI bootloader 
is called from an application that modified the contents of SCIHBAUD to be non-zero, then 
the SCI will not autobaud-lock and the SCI bootloader will not execute.

Workaround

Clear SCIHBAUD to zero before calling the ROM SCI Bootloader.

Advisory

Boot-ROM, MPOST: Longer Boot Time With MPOST Enabled

Revisions Affected

0, A, B

Details

When MPOST functionality is enabled through user OTP, the boot-ROM execution time is 
around 5 seconds. This is because the boot-ROM executes MPOST with INTOSC clock of 
10 MHz, which results in longer boot time.

Workaround

Avoid using boot-ROM supported MPOST and perform necessary memory self-tests as 
part of application initialization.

Silicon Revision B Usage Notes and Advisories

www.ti.com

28

TMS320F28004x Real-Time MCUs Silicon Errata
Silicon Revisions B, A, 0

SPRZ439G – JANUARY 2017 – REVISED AUGUST 2022

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Copyright © 2022 Texas Instruments Incorporated

Summary of Contents for TMS320F28004 Series

Page 1: ...and Advisories 40 5 1 Silicon Revision 0 Usage Notes 40 5 2 Silicon Revision 0 Advisories 40 6 Documentation Support 42 7 Trademarks 42 8 Revision History 42 List of Figures Figure 2 1 Examples of Dev...

Page 2: ...puts in GPIO Asynchronous Mode Yes Yes Yes VDD Supply VDD Supply During VDDIO Power Up VDD May Also Rise Yes Yes Yes eCAP eCAP HRFRC is Not EALLOW Protected Yes Yes Yes PLL PLL PLL May Not Lock on the...

Page 3: ...Yes Yes ROM ROM Flash API Library and FPU32 Twiddle Factor RFFT Table Not Present Yes Yes REVID REVID Some TMX Revision A Devices Have an Incorrect REVID Value Yes GPIO GPIO X2 GPIO18 Pin Pullup Curr...

Page 4: ...ed development support product TMX and TMP devices and TMDX development support tools are shipped against the following disclaimer Developmental product is intended for internal evaluation purposes Pr...

Page 5: ...Code 2 Digit Year Month Code Assembly Lot Assembly Site Code Wafer Fab Code one or two characters as applicable Silicon Revision Code Green Low Halogen and RoHS compliant G4 F280049 YMLLLLS RSHS TI P...

Page 6: ...e Nomenclature Nomenclature Package Symbolization and Revision Identification www ti com 6 TMS320F28004x Real Time MCUs Silicon Errata Silicon Revisions B A 0 SPRZ439G JANUARY 2017 REVISED AUGUST 2022...

Page 7: ...pt is triggered depends on the configuration and timing of the other interrupts in the system This is expected to be a rare or nonexistent event in most applications If it happens the unwanted interru...

Page 8: ...erformed by a VCU instruction VMOV32 and one write performed by an FPU instruction MOV32 If a pipeline stall occurs during the first write then the second write can corrupt the data If the first instr...

Page 9: ...the nesting feature then the user must disable the interrupts before exiting the ISR Failing to do so may cause undefined behavior of CPU execution www ti com Silicon Revision B Usage Notes and Adviso...

Page 10: ...the same register R6H as its source and a CPU register as the destination If a stall occurs in the E3 pipeline phase then MOV32 will read the value of R6H before the MPYF32 instruction completes Examp...

Page 11: ...e is a Stall in the E3 Slot of the Instruction I1 Workaround Treat MPYF32 ADDF32 SUBF32 and MACF32 in this scenario as 3p cycle instructions Three NOPs or non conflicting instructions must be placed i...

Page 12: ...ters E3 thus forwarding is not needed I5 I4 I3 I2 I1 There is no change due to the stall in the previous cycle I5 I4 I3 I2 I1 moves out of E3 and I5 moves to R2 R6H has the result of R5H R0H and is re...

Page 13: ...vents will be triggered The spurious data ready event will trigger a corresponding CPU interrupt CLA task and DMA trigger if configured appropriately Workaround When SDFM data filter settings need to...

Page 14: ...ple of SYSCLK This situation can be unavoidable if the clock sources for either the SD modulator or this device have a wide variation since a wide range of keep out frequencies become problematic If t...

Page 15: ...ltaneous direction change will reset the counter properly and work as expected Workaround Do not use the PCRM 0 configuration if the direction change could occur while the index is active and the resu...

Page 16: ...IO is greater than 1 ms when in internal VREG mode This does not impact device functionality once the external 1 2 V or internal 1 2 V supply begins to ramp See the TMS320F28004x Real Time Microcontro...

Page 17: ...r is not required To enable software reuse on other devices where HRFRC is EALLOW protected using EALLOW and EDIS is recommended Workaround None www ti com Silicon Revision B Usage Notes and Advisorie...

Page 18: ...commends doing lock sequences in succession until the PLL is in locked state when the PLL is configured for the first time after power up The lock sequence is disable the PLL start the PLL wait for th...

Page 19: ...ional power reduction can be optionally achieved through software by one or all of these methods Decrease the SYSCLK frequency Change the SYSCLK source to OSCCLK by configuring SYSPLLCTL1 PLLCLKEN 0 C...

Page 20: ...ons ends DCC operation prematurely TI recommends rerunning DCC if any of the below conditions are met DCCSTATUS DONE 1 and DCCCNT1 0 or DCCCNT0 0 or DCCVALID0 0 DCCSTATUS ERROR 1 and DCCCNT1 0 and DCC...

Page 21: ...ed system behavior with other system components then do not use XRSn to drive other devices An external voltage supervisor can be used for these applications 3 For applications that need to avoid thes...

Page 22: ...begins its ACK cycle This occurs because the slave may already be driving SDA low before the unexpected high level pulse occurs The glitch that occurs on SDA as a result of this short period of conten...

Page 23: ...SDA MCU I2C I2C Figure 3 4 Placement of Series Termination Resistor and Pullup Resistor www ti com Silicon Revision B Usage Notes and Advisories SPRZ439G JANUARY 2017 REVISED AUGUST 2022 Submit Docum...

Page 24: ...e Trip State Active State Trip State Active State Trip State Active State Figure 3 6 Resulting Undesired ePWM Outputs Possible Workaround Extend or reduce the blanking window to avoid any undesired tr...

Page 25: ...of this drift the INTOSC1 and INTOSC2 internal oscillator frequencies could fall below the minimum values specified in the data sheet This would impact applications using INTOSC2 as the clock source...

Page 26: ...n the receive buffer before the first data word is read NWORD packet with 16 words then the following sequence can be used Ignore RX buffer overrun RX_EVT_STS BUF_OVERRUN On RX_EVT_STS FRAME_DONE read...

Page 27: ...which they were received If the order of the messages is critical to the application for processing then this behavior will prevent the proper use of the DCAN FIFO mode Workaround Use the DMA to read...

Page 28: ...AUD to zero before calling the ROM SCI Bootloader Advisory Boot ROM MPOST Longer Boot Time With MPOST Enabled Revisions Affected 0 A B Details When MPOST functionality is enabled through user OTP the...

Page 29: ...dresses 0x7F8 0x7FF should not be used for code Example 2 M0 ends at address 0x3FF and valid memory M1 follows it Code in M0 can be stored up to and including address 0x3FF Code can also cross into M1...

Page 30: ...und will avoid this condition for any SYSCLK to OSCCLK ratio Workaround Add a software delay of 300 SYSCLK cycles using an NOP instruction after every write to the CLKSRCCTL1 register Example ClkCfgRe...

Page 31: ...R when clearing the ADCINTFLG Check ADCINTOVF immediately after writing to ADCINTFLGCLR if it is set then write ADCINTFLGCLR a second time to ensure the ADCINTFLG is cleared The ADCINTOVF register wil...

Page 32: ...e ADCINT trigger is set As a result the DMA could read a prior ADCRESULT value when the user expects the latest result if all of the following are true The ADC is in late interrupt mode The ADC operat...

Page 33: ...ctive HLC channel Workaround Reorder the HLC instructions so that every PUSH instruction is followed by a non PUSH instruction The same applies for the PULL instruction If only one HLC channel is acti...

Page 34: ...ate voltage level may be incorrectly interpreted as a high level if there is not sufficient logic filtering present in the receiver logic to filter this brief pulse Workaround If contention is a conce...

Page 35: ...ll for the SCIFLR BUSY flag to set 2 Once the BUSY flag goes high poll for the SCIFLR RXRDY flag Concurrently within this loop also have a SW timeout which times out and exits the loop if the RXRDY fl...

Page 36: ...3 should be written to ANAREFPP 56 pin RSH package The value 0x0003 should be written to ANAREFPP Advisory Analog Trim of Some TMX Devices Revisions Affected 0 A Details Some TMX samples may not have...

Page 37: ...m can be generated by following the instructions in the ADC Zero Offset Calibration section of the TMS320F28004x Real Time Microcontrollers Technical Reference Manual If the internal oscillator trim c...

Page 38: ...Real Time Microcontrollers Technical Reference Manual Workaround None Advisory REVID Some TMX Revision A Devices Have an Incorrect REVID Value Revision Affected A Details Some early TMX Revision A dev...

Page 39: ...tch without compensating termination 2 The input sees large transients from external noise sources that rise above VDDIO 0 3 V at the pin 3 The input is driven by a device powered by a different volta...

Page 40: ...con Revision B Advisories Advisory GPIO Pins may Drive High During Power Up Revision Affected 0 Details During power up the following pins will temporarily be in output mode and drive high These pins...

Page 41: ...ing the condition Larger capacitors will be more effective at filtering the transient but must be balanced against the system level timing requirements of these pins For input pins a smaller capacitor...

Page 42: ...Section 1 Usage Notes and Advisories Matrices Added section 2 Section 2 1 Device and Development Support Tool Nomenclature Updated section 4 Section 2 2 Devices Supported Added section 4 Section 2 3...

Page 43: ...change without notice TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource Other reproduction and display of thes...

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